Definition 2.1 ([1]}, [2]}) 
The set of sequences \(\lbrace t_k^p\rbrace \) , where \(t_k^p=t_{k+p}-t_k, p, k\in \mathbb {Z}\) ,
is said to be uniformly almost periodic if for any positive number
\(\epsilon \) , there exists a relatively dense set of \(\epsilon \) -almost
periods common for all sequences.

